LL1语法分析程序，输入文法表达式能够自动输出预测分析表，判断是否为LL1文法，还可以再输入任意的一个句子，然后对其进行分析，给出分析进栈出战的详细过程-LL1 parser, enter the grammar of expression that can automatically predict the output table to determine whether the LL1 grammar, you can enter any of a sentence, and then analyze it, given the detailed analysis of the course played into the stack